This revision include the following changes:
 - [1] the Essentials class had some changes to the plugin version in its documentation made, and also will now include library classes from the "lib" folder. It also has a method to load asset files from the "<plugin-root>/data" folder.
 - [2] the Interception_Manager class had some changes to the plugin version in its documentation made.
 - [3] All other classes has a minor-one line change made which shows that the class was inside of the "lib" package, and no longer the "includes" folder.
 - [4] travel-assistant.php now properly includes the Interception_Manager class inside of the "lib" package.